Tail-stock for watchmaker&#39;s lathes.



N0. 690,929. I Patented Jan. 14, I902.

W. D. CLEMENT. TAIL-STOCK FOR WATGHMAKEBS LATHES.

(Application flied Oct. 3, 1900.) (No Model.) 2 Sheais -Sheet l.

No.690,929. Paten ted'JamM. I902.

w. n. CLEMENT.

TAIL-STOCK FOR WATCHMAKEBS"LATHES.

(Application filed Opt. 3, 1900. (No Modal.) 1 2 Sheets-Sheet '2.

NlTED STATES arnsrr rrrcn.

WILLIAM D. CLEMENT, OF W'ALTHAM, MASSACHUSETTS.

TAIL-STOCK FOR WATCHIVIAKERS LATHES.

SPEGIFIGATION forming part of Letters Patent No. 690,929, dated J anuary14, 1902.

Application filed October 3, 19(10- Serial No. 31,823. (No model.)

T (LZZ whom i2; rmty concern:

Be it known that I, WILLIAM D. CLEMENT, of Waltham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Tail-Stocks for Watchmakers Lathes, of which the following is a specification.

This invention relates to lathes, and more particularly to the tail-stock construction of watchmakers lathes.

The object of the invention is to provide for performing a greater number of operations with the tail-stock as an accessory than have been performed heretofore and to perform operations therewith which have heretofore involved the use of a slide-rest and various separate attachments.

Theinvention consists in the novel features of construction and arrangement which I sh all now proceed to describe and claim.

Of the accompanying drawings, Figure 1 represents a front elevation of the tail-stock and part of the lathe-bed. Fig. 2 represents a rear elevation thereof. Fig. 3 represents a side elevation, partly in section. Fig. at represents a plan view. Fig. 5 represents a section on the line 5 5 of Fig. 3. Fig. 6 represents a section on the same line with the screw-feed detached. Fig. 7 represents a section on the line 7 7 of Fig. 6. Figs. 8 and 9 represent end elevations in different positions, and Fig. 10 and 11 plan views in different positions and with parts broken away and in section, of a tool-holder attachment for the dead-spindle. Figs. 12 and 13 represent side elevations, and Figs. 14 and 15 two positions in end elevation, of a polishing attachment. Fig. 16 represents a side elevation, Fig. 17 a plan, and Figs. 18 and 19 front and rear elevations, of a filing attachment. Figs. 20 and 21 represent end and side elevations, Fig. 22 a plan,'and Fig. 23 a section on line 25 25 of Fig. 21, of a rounding-up tool or attachment.

The same reference characters indicate the same parts in all the figures.

Referring to the drawings, 1 represents the lathe-bed, and 2 represents the tail-stock, mounted to slide there-along toward or away from the head-stock, which is not herein illustrated.

The tail-stock 2 comprises a base 3, mounted on the guides or inclines of the lathe-bed, and an upper portion or frame 4, carrying the dead or tail spindle 5 and mounted to turn upon the base 3 on a vertical bolt 6 as a center. The head at the lower end of said bolt runs in the T-groove of the lathe-bed, and its upper end is provided with a clamping-1e ver 7, by turning which the tail-stock is clamped to or loosened from the lathe-bed, and the upper or frame part 4; of the tail-stock is also clamped to or loosened from the base part 3 thereof.

8, Fig. 4, is a stop-screw fixed in the base 3 and occupying a segmental slot 9 in the frame 4, whereby the angular movements of the frame 4 are limited. The rear vertical faces of the base and frame are arc-shaped or segmental in form on a radius from the center bolt 6, and the frame-face is marked with a degree-scale 10, Fig. 2, cooperating with a mark 11 on the base-face to indicate the angular position of the tail-spindle.

12 is an arm forming a part of the tail-stock frame 4 and having a series of gage-tongues 13 13 at its upper end.

14 is a rock-frame mounted to oscillate on a horizontal pintle 15 on the tail-stock frame 4 and carrying at its upper end a gage plate or strip 16, parallel to the ends of the tongues 13. The tail-spindle 5 is carried by the rockframe 14 at a point midway between the axis of oscillation of said rock-frame and the ends of the gage-tongues. If a jewel be placed between the gage plate 16 and the end of one of the tongues 13 and a boring-tool be fixed to the tail-spindle 5, with its cutting edge in line with the axis of the tail-spindle, the tool will bore a hole in the setting or face-plate held in the chuck on the live-spindle which will just fit the jewel.

17 is a compound feed-screw by means of which the rock-frame lat is oscillated.

The above-described construction is commonly known as a jeweling attachment, and the manner of its operation is well known.

"When the gage-plate 16 is in contact with the tongues 13, the tail-spindle is then on the Ioo and is provided with an adjustable arm 19, engaged with a guide-rod to prevent it from rotating. The arm 19 has a removable lower part 21, engaged with a compound feed-screw 22, which is mounted in the rook-frame 14, whereby a slow longitudinal feed or adjustment'may be given to the spindle. The arm 19 also has the usual adjustable stop-screw 23.

By providing a horizontal angular adjustment for the tail-spindle I considerably enlarge the capabilities of the tail-stock, for with this adjustment it is possible to make many angular borings or cuts with tools mounted on the tail-spindle which are not feasible with the tail-stocks as commonly constructed prior to my invention. The use of the jeweling attachment in connection with the angular adjustment of the tail-spindle permits the attainment of different degrees of taper in off-center work. The tail-spindle being adjustable about a vertical axis and also adjustable in parallelism to its longitudinal axis in a path perpendicular to said longitudinal axis I am enabled to describe lines or make cuts on a concave surface by means of a tool mounted on the spindle.

Figs. 3, 4, and 8 to 11, inclusive, show a novel form of tool-holder applied to thetailspindle. Said holder has a shank 24, adapted to fit in the taper bore of the spindle, and a head at the outer end of said shank, having two cars 25, between which, on a pintle 26, is pivoted a block or holder 27. This block has provisions for holding two tools 28 29, which are brought into operative position alternately by swinging the block 27 on its pivot. The two positions of the block are exactly at right angles and are determined by means of two adjustable stop-screws 30 31, which abut against the head of the holder. The tools 28 29, as shown in the drawings, are for an inside and an outside cut, respectively, and when brought into operative position their cutting edges will be located on the center line of the spindle 5. By screwing up the pintle 26 the cars 25 may be sprung together and the holder 27 frictionally clamped in any of its positions.

Figs. 12 to 15, inclusive, illustrate a polishing device for pivots and other parts, which by a novel arrangement I mount on the tailspindle 5. 32 is a collar which is slipped on the spindle 5 and held in place bya set-screw Said collar has a perforated offset lug 34, which is embraced by two lugs or ears 35 35, formed on a block or plate 36. The joint is a friction-tight one and is bound by a screw 37, passing loosely through one ear 35 and the lug 34 and screwing in the other ear 35, said screw serving to spring the cars 35 slightly upon the lug. 38 is a frame pivoted to the plate 36 with a friction-tight hingejoint and having bearings for an arbor 39.

To the latter, at its outer end, is affixed a polishing-wheel 40, and between the bearings is atfixed to said arbor a belt-pulley 41, adapted to be belted to a counter-shaft, so as to rotate the polishing-wheel. A spring 42 presses the pulley and arbor in one direction, and a pivoted lcver43 is adapted to be manipulated by the operator to press the same in the opposite direction, whereby an axial reciprocating movement is given to the polishing-wheel, the extremes of position of the parts being indicated by full and dotted lines in Fig. 13. By swinging the frame 38 with respect to the plate 36 the polishing-wheel may be moved in the direction of the work or the line of centers, as represented in Fig. 14, or away therefrom, as represented in Fig. 15. The same collar which is employed in the above construction may be used to support a filing fixture upon the spindle, as represented in Figs. 16 to 19, inclusive. The link or rocker-bar 44of the fixturecarrying the rolls: 45 for guiding the file is in this case journaled bya screw pintle 46, which passes through the eye of the log 34.

Figs. 20 to 23, inclusive, show the hinged plate and frame 36 38 utilized as a part of a gear cutting or rounding-up" attachment. The cleft between the ears 35 35 is made circular at its innerend to fit the spindle 5, over which the plate 36 maybe slipped and clamped by tightening the screws 37. The gear which is to be rounded up or to have its teeth out is held between two centers 47 47, which are mounted in alinement in the arms of the frame 38 and adj ustably held by set-screws 48 48 and is supported by an adjustable rest 49. The gear thus held may be moved toward or from the cutter on the live-spindle by swinging the frame 38 with respect to the plate 36.

I claim- 1. In a lathe, a horizontal tail-stock spindle, mounted to turn about a vertical axis'and guided tomove with its longitudinal axis in parallelism to itself in a path perpendicular to itself.

2. In a lathe, a horizontal tail-stock spindle, mounted to turn about a vertical axis and to swing about an axis parallel to its longitudinal axis.

3. In a lathe, a base, a frame pivoted thereto on a vertical axis, a horizontal spindle, and a bearing for the spindle guided to move on the frame in a path perpendicular to the axis of the spindle.

4. In a lathe, a base, a frame pivoted thereto on a vertical axis, a horizontal spindle, and a bearing for the spindle hinged to the base on an axis parallel to the spindle.

5. In a lathe, a base, a frame pivoted thereto on a vertical axis, a horizontal spindle, a bearing for the spindle guided to move on the frame in a path perpendicular to the axis of the spindle, and provisions for adjusting the spindle axially in its bearing.

6. In a lathe,a tail-stock comprising a base, a frame pivoted thereto on a vertical axis and having a jewel-holding jaw, a rock-frame hinged to said frame on a horizontal axis and havingacomplementaljewel-holdingjaw,and a spindle mounted on said rock-frame parallel to the hinge-axis half-Way between said axis and said complemental jaw.

7. An attachment for lathes comprising a head having a couplingstem, and a holder having provisions for holding a plurality of tools and pivoted on an axis at right angles to the longitudinal axis of the stem, whereby to aline with the said axis any tool thus held.

8. In a lathe, a tail-spindle, and a tool-holding device mounted thereon and comprising a tool-holder having provisions for holding two cutting-tools and movable pivotally on an axis perpendicular to the axis of the spin- 

